U.S. patent number 3,725,480 [Application Number 05/081,190] was granted by the patent office on 1973-04-03 for ashless oil additives.
This patent grant is currently assigned to Standard Oil Company. Invention is credited to Randel Q. Little, Thornton P. Traise, Roger W. Watson.
United States Patent |
3,725,480 |
Traise , et al. |
April 3, 1973 |
ASHLESS OIL ADDITIVES
Abstract
This invention concerns the condensation product of an aldehyde
reactant having more than one carbon atom and/or ketone reactant,
formaldehyde, an alkylene polyamine, and an alkyl-substituted
phenol. These compositions can be used as ashless alkaline
additives for lubricating oils.
Inventors: |
Traise; Thornton P. (Chicago
Heights, IL), Watson; Roger W. (Batavia, IL), Little;
Randel Q. (Munster, IN) |
Assignee: |
Standard Oil Company (Chicago,
IL)
|
Family
ID: |
26765303 |
Appl.
No.: |
05/081,190 |
Filed: |
October 15, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
774497 |
Nov 8, 1968 |
3591598 |
|
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Current U.S.
Class: |
564/367; 528/156;
528/227; 564/368; 568/780; 508/542; 528/162; 548/300.1;
568/716 |
Current CPC
Class: |
C10M
159/16 (20130101); C07D 213/74 (20130101); C10M
2215/225 (20130101); C10M 2215/04 (20130101); C10M
2215/221 (20130101); C10M 2215/30 (20130101); C10M
2217/046 (20130101); C10M 2217/02 (20130101); C10M
2215/14 (20130101); C10M 2215/226 (20130101); C10M
2217/06 (20130101); C10M 2217/00 (20130101); C10M
2217/04 (20130101); C10M 2215/22 (20130101); C10M
2215/26 (20130101) |
Current International
Class: |
C10M
159/00 (20060101); C10M 159/16 (20060101); C07D
213/00 (20060101); C07D 213/74 (20060101); C08g
009/04 (); C08g 009/26 (); C08g 009/34 (); C08g
037/24 (); C08g 037/18 (); C08g 037/36 () |
Field of
Search: |
;260/296R,583P,51.5,268R
;252/51.5R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Jiles; Henry R.
Assistant Examiner: Bond; Robert T.
Parent Case Text
RELATED APPLICATIONS
This application is a divisional of U.S. application Ser. No.
774,497, filed Nov. 8, 1968 now U.S. Pat. No. 3,591,598 and
entitled ASHLESS OIL ADDITIVES.
Claims
We claim:
1. The reaction product of (a) formaldehye; (b) an alkylene
polyamine having the formula: H.sub.2 N(--alkylene--NH).sub.n H in
which n is an integer from 1 to 10 and "alkylene" has from two to
eight carbon atoms; (c) an alkyl-substituted phenol wherein the
alkyl group has less than 40 carbon atoms; and (d) an aldehyde
reactant or a ketone reactant, or a mixture of said aldehyde
reactant and ketone reactant, said adehyde reactant and/or ketone
reactant having from six to 18 carbon atoms, said formaledhyde,
polyamine and substituted phenol being reacted at a temperature of
from about 100.degree. C to about 200.degree. C in the respective
molar ratios of about 1-2:1-2:1, and said aldehyde reactant and/or
ketone reactant being reacted in an amount sufficient to impart oil
solubility to the product at a temperature of from about
100.degree. C to about 200.degree. C.
2. The condensation product defined in claim 1 wherein the
formaldehyde, polyamine, substituted phenol and the aldehyde
reactant and/or ketone reactant are reacted in the respective molar
ratios of about 1-2:1-2:1:1-4.
3. The composition defined in claim 2 wherein the alkyl substituent
of the alkyl-substituted phenol contains from one to 18 carbon
atoms.
Description
BACKGROUND OF THE INVENTION
Known lubricating oils for engines develop acidic materials which
react with the oil to form sludge and varnish that interfere with
the operation of the engine. The addition of alkaline additives to
oils neutralizes the acidic materials, rendering them harmless.
Many conventional additives include metals, and these
metal-containing additives make their way into the combustion
chamber of the engine and are burned, leaving an ash which hampers
the performance of the engine and which is occasionally blown from
the exhaust as red-hot particles that can cause fires. Researchers,
in attempting to find ashless additives which are soluble or
miscible in lubricating oil and which themselves do not harm engine
parts, have investigated low molecular weight Mannich compounds.
However, at effective concentrations, many of these Mannich
compounds are immiscible with or insoluble in lubricating oils.
SUMMARY OF THE INVENTION
We have discovered novel compositions which serve as highly active
ashless alkaline additives for oil. These compositions, which are
oil-soluble or oil-miscible, can be made by either of two methods.
The first, and preferred, method calls for reacting an aldehyde
reactant having more than one carbon atom, or a ketone reactant, or
a mixture of said aldehyde and ketone reactants with the following
Mannich condensation product: Mannich products formed by the
condensation of an alkyl-substituted phenol, formaldehyde, and an
alkylene polyamine. The second method calls for reacting an
aldehyde reactant having more than one carbon atom, or a ketone
reactant, or a mixture of said aldehyde and ketone reactants with
an alkylene polyamine to form an intermediate, and then reacting
the intermediate with formaldehyde and an alkyl-substituted phenol.
The reactions are exothermic, but we usually heat the reaction
mixture to a temperature between about 100.degree. C and about
200.degree. C, preferably between about 110.degree. C and about
180.degree. C. This additional heating drives the reactions to
substantial completion and removes water of condensation from the
product.
The above-mentioned Mannich condensation product is a strong
anti-acid. But, if it has a low molecular weight, it is not readily
soluble in oil. We have found that these low molecular weight
Mannich condensation products react with aldehydes and ketones to
produce excellent alkaline additives which are soluble or miscible
in oil. Oils containing a minor amount of the alkaline additives of
our invention, generally from about 5 to about 20 weight percent,
do not deleteriously affect engines and, in fact, they have many
advantages in use.
The reaction between the various starting materials is very complex
and, therefore, we cannot demonstrate with certainty the precise
formula of the alkaline additives of our invention. We do, however,
know that the carbonyl group of the aldehyde reactant or ketone
reactant is capable of reacting with one or more of the several
different reactive amino groups available. The following equations
show some of the possible reactions and illustrate said complexity:
##SPC1## ##SPC2##
Equation (1) illustrates the reaction between the secondary amino
group of the polyamine moiety and the carbonyl group of the
aldehyde reactant or ketone reactant to form a cyclic group.
Equation (2) illustrates the reaction between the primary amino
group of the polyamine moiety and the carbonyl group of the
aldehyde reactant or ketone reactant to form an imine group. Only
one of these reactions may be dominating, but it is possible that
all occur simultaneously and at about the same rate. Because of the
availability of so many different reactive amino groups, the amount
of aldehyde and/or ketone reactants used may vary greatly. The only
criterion is that the aldehyde and/or ketone reactants be added
until the condensation product is soluble in oil. In general,
formaldehyde, polyamine, and the substituted phenol are reacted
inthe respective molar ratios of about 1-2:1-2:1. When the
formaldehyde, polyamine, and phenol are reacted in these relative
proportions, generally from 1-4 moles of aldehyde and/or ketone
reactant is employed.
Preferably, the aldehyde and ketone reactants have at least six
carbon atoms. The greater number of carbon atoms in the aldehyde
and ketone reactants and the greater the branching of the
hydrocarbon chain of these reactants, the more oil-soluble the
condensation product. We especially prefer those aldehyde and
ketone reactants having branched alkyl groups containing from six
to 18 carbon atoms. Examples of suitable aldehyde reactants are:
hexanal, heptanal, 2-methyl heptanal, 2-ethyl heptanal,
2-methyl-4-ethyl heptanal, 3-methyl decanal, 3,5-dimethyl decanal,
3-ethyl-5-methyl decanal, 5-butyl decanal, 5-methyl-6-butyl
decanal, 5-methyl pentadecanal, 5-ethyl pentadecanal, and 3-methyl
heptadecanal. Examples of suitable ketone reactants are:
2-hexanone, 3-heptanone, 3-octanone, 2-methyl-3-octanone,
2-ethyl-3-octanone, 5-methyl-3-decanone, 5-ethyl-3-decanone,
5-propyl-3-decanone, 5-propyl-3-undecanone, 5-penta-3-decanone,
2-methyl-5-pentadecanone, 2-ethyl-5-pentadecanone, and
2-propyl-5-pentadecanone.
The alkyl substituents of preferred alkyl-substituted phenols
contain less than about 40 carbon atoms, and most preferably
contain branched alkyl groups from about one to about 18 carbon
atoms.
Suitable alkylene polyamines generally come within the following
formula:
H.sub.2 N (--alkylene--NH).sub.n H
in which n is an integer from about 1 to about 10, and "alkylene"
is a saturated divalent hydrocarbon having from about two to about
eight carbon atoms. The preferred alkylene polyamines are ethylene
polyamines ("alkylene" having two carbon atoms) of which
tetraethylene pentamine is the most preferred. Other alkylene
polyamines include, for example, propylene polyamines, butylene
polyamines, and cyclic homologues of such polyamines, for example
piperazines. Specific examples of still other alkylene polyamines
are: ethylene diamine, diethylene triamine, pentaethylene
tetramine, and N-2-aminoethyl-piperazine.
PREPARATION OF MANNICH CONDENSATION PRODUCT
Mix 5 moles of p-nonylphenol and 10 moles of tetraethylene
pentamine in a suitable flask fitted with stirring apparatus,
reflux condenser, a Barrett trap, and a nitrogen inlet tube. Then,
with stirring, slowly add to the flask over a period of about 2
hours 10 moles of formaldehyde dissolved in water (63 weight
percent water). As formaldehyde is added, the temperature of the
reaction mixture rises from ambient to about 70.degree. C. When all
the formaldehyde is added, stop stirring, inject nitrogen into the
reaction mixture as an aid in removing water, and heat for several
hours (about 36), gradually increasing temperature from 70.degree.
to 160.degree. C to remove the water added with the formaldehyde
and the water formed during the condensation reaction. The water
collects in the Barrett trap. A Mannich condensation product so
prepared has an average molecular weight of about 557.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
EXAMPLE I
Dissolve 1.8 moles of Mannich product in 500 milliliters of
isopropyl alcohol contained in a suitable flask fitted with a
reflux condenser, stirring apparatus, a Barrett trap, and a
nitrogen inlet tube. With stirring. slowly add to the flask over a
period about 1 hour 3 moles of a mixture of branched chain
aldehydes containing 10 carbon atoms (Enjay Chemical Co. MD-223).
As this mixture of aldehydes is added, the temperature of the
reaction will rise from ambient to about 55.degree. C. When all the
aldehyde is added, inject nitrogen into the reaction mixture, and
heat the mixture for several hours (about 36), gradually increasing
the temperature from 55.degree. to 170.degree. C to remove the
alcohol and by-product water. An alkaline additive so prepared has
a molecular weight of about 600, and is readily dispersed in SAE-5W
oil. To make this additive even more oil-soluble, it is reacted
with more aldehydes as described in Example II.
EXAMPLE II
In a suitable flask, mix 1.2 moles of the alkaline additive made in
Example I with 700 grams of SAE-5W oil. Then, with stirring, slowly
add to the mixture over a period of about 35 minutes 0.9 mole of
the mixture of C.sub.10 aldehydes. As the aldehyde is added, the
temperature of the reaction mixture rises from ambient to about
36.degree. C. Cover the mixture with nitrogen and heat at
150.degree. C for about 2 hours, and then cool. The alkaline
additive thus prepared is a bright amber oily material which is
soluble in hot oil.
EXAMPLE III
Dissolve 1.8 moles of Mannich product in 500 grams of SAE-5W oil
contained in a suitable flask fitted with the necessary stirring,
reflux, and nitrogen feed equipment. Inject nitrogen into the flask
and slowly, with stirring, add to the flask over a period of about
1 hour 4 moles of the mixture of C.sub.10 aldehydes. Then heat for
several hours while injecting nitrogen. An alkaline additive so
prepared is soluble in hot oil.
EXAMPLE IV
In a suitable flask fitted with suitable equipment, mix 1 mole of
Mannich product with 500 grams of SAE-5W oil, and then add 2 moles
of hexanal and 2 moles of 2-methyl-3-octanone. Heat the reaction
mixture for several hours and inject nitrogen to remove water. An
alkaline additive so prepared is oil-soluble.
The above examples have been presented merely to illustrate the
preferred embodiments of our invention. Those skilled in the art
will immediately appreciate that these examples can be changed in
many details. For example, other aldehydes, ketones, and Mannich
products coming within the scope of our disclosure will react
similarly to those illustrated in the examples.
* * * * *